Income and Other Taxes (Tax Reform) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Tax Reform [Line Items]
Income Tax Expense (Benefit)	$ 502	$ 409	$ 458
Net Increase in Regulatory Liability	63	88	(13)
Deferred Tax Liabilities, Net	3,551	3,064
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Income Tax Expense (Benefit)			321
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Deemed Dividend [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			397
Income Tax Expense (Benefit)			139
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(67)
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(330)
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Foreign Tax Credit [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			(157)
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Valuation Of Foreign Tax Credit Carryforward [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			110
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			229
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Income Tax Expense (Benefit)			321
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Deemed Dividend [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			462
Income Tax Expense (Benefit)			161
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(462)
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Foreign Tax Credit [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			(205)
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Valuation Of Foreign Tax Credit Carryforward [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			145
Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			220
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Income Tax Expense (Benefit)			0
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Deemed Dividend [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(65)
Income Tax Expense (Benefit)			(22)
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(67)
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			132
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Foreign Tax Credit [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			48
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Valuation Of Foreign Tax Credit Carryforward [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			(35)
Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			9
PPL Electric Utilities Corp [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	167	149	136
Net Increase in Regulatory Liability	40	43	19
Deferred Tax Liabilities, Net	1,559	1,447
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(107)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(39)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(68)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			(13)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(105)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(105)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			(13)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(2)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(39)
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			37
PPL Electric Utilities Corp [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			0
LG And E And KU Energy LLC [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	106	103	129
Net Increase in Regulatory Liability	26	45	(32)
Deferred Tax Liabilities, Net	1,175	1,069
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(60)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(28)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(32)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			110
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(45)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(45)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			112
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(15)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(28)
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			13
LG And E And KU Energy LLC [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Reduction In U.S. Federal Income Tax Rate [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)			(2)
Louisville Gas And Electric Co [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	62	63	64
Net Increase in Regulatory Liability	0	19	(5)
Deferred Tax Liabilities, Net	716	697
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(17)
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			17
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(17)
Louisville Gas And Electric Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			17
Kentucky Utilities Co [Member]
Tax Reform [Line Items]
Income Tax Expense (Benefit)	63	79	76
Net Increase in Regulatory Liability	26	26	(27)
Deferred Tax Liabilities, Net	$ 835	$ 792
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(11)
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Return [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			11
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | Adjustments Per 2017 Tax Provision [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			0
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Bonus Depreciation [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			(11)
Kentucky Utilities Co [Member] | Tax Cuts And Jobs Act [Member] | 2018 Adjustment [Member] | Consolidated Federal Net Operating Losses Due To The TCJA [Member]
Tax Reform [Line Items]
Taxable Income (Loss)			$ 11